/****************************************************************************
 *
 * Copyright 2016 Samsung Electronics All Rights Reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
 * either express or implied. See the License for the specific
 * language governing permissions and limitations under the License.
 *
 ****************************************************************************/
/*
 *  SSL server demonstration program
 *
 *  Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
 *  SPDX-License-Identifier: Apache-2.0
 *
 *  Licensed under the Apache License, Version 2.0 (the "License"); you may
 *  not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *  http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 *  WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 *
 *  This file is part of mbed TLS (https://tls.mbed.org)
 */

#if !defined(MBEDTLS_CONFIG_FILE)
#include "mbedtls/config.h"
#else
#include MBEDTLS_CONFIG_FILE
#endif

#if defined(MBEDTLS_PLATFORM_C)
#include "mbedtls/platform.h"
#else
#include <stdio.h>
#define mbedtls_fprintf    fprintf
#define mbedtls_printf     printf
#endif
#undef MBEDTLS_TEST_ON_NUTTX

#ifdef MBEDTLS_TEST_ON_NUTTX
/*
#if !defined(MBEDTLS_BIGNUM_C) || !defined(MBEDTLS_CERTS_C) ||    \
    !defined(MBEDTLS_ENTROPY_C) || !defined(MBEDTLS_SSL_TLS_C) || \
    !defined(MBEDTLS_SSL_SRV_C) || !defined(MBEDTLS_NET_C) ||     \
    !defined(MBEDTLS_RSA_C) || !defined(MBEDTLS_CTR_DRBG_C) ||    \
    !defined(MBEDTLS_X509_CRT_PARSE_C) || !defined(MBEDTLS_FS_IO) || \
    !defined(MBEDTLS_PEM_PARSE_C)*/
int main_ssl_server(void)
{
	mbedtls_printf("MBEDTLS_BIGNUM_C and/or MBEDTLS_CERTS_C and/or MBEDTLS_ENTROPY_C " "and/or MBEDTLS_SSL_TLS_C and/or MBEDTLS_SSL_SRV_C and/or " "MBEDTLS_NET_C and/or MBEDTLS_RSA_C and/or " "MBEDTLS_CTR_DRBG_C and/or MBEDTLS_X509_CRT_PARSE_C " "and/or MBEDTLS_PEM_PARSE_C not defined.\n");
	return (0);
}
#else

#include <stdlib.h>
#include <string.h>

#if defined(_WIN32)
#include <windows.h>
#endif

#include "mbedtls/entropy.h"
#include "mbedtls/ctr_drbg.h"
#include "mbedtls/certs.h"
#include "mbedtls/x509.h"
#include "mbedtls/ssl.h"
#include "mbedtls/net.h"
#include "mbedtls/error.h"
#include "mbedtls/debug.h"

#if defined(MBEDTLS_SSL_CACHE_C)
#include "mbedtls/ssl_cache.h"
#endif

#define HTTP_RESPONSE \
	"HTTP/1.0 200 OK\r\nContent-Type: text/html\r\n\r\n" \
	"<h2>mbed TLS Test Server</h2>\r\n" \
	"<p>Successful connection using: %s</p>\r\n"

#define DEBUG_LEVEL 0

static void my_debug(void *ctx, int level, const char *file, int line, const char *str)
{
	((void)level);

	mbedtls_fprintf((FILE *)ctx, "%s:%04d: %s", file, line, str);
	fflush((FILE *)ctx);
}

int main_ssl_server(void)
{
	int ret, len, iii;
	mbedtls_net_context listen_fd, client_fd;
	unsigned char buf[1024];
	const char *pers = "ssl_server";

	mbedtls_entropy_context entropy;
	mbedtls_ctr_drbg_context ctr_drbg;
	mbedtls_ssl_context ssl;
	mbedtls_ssl_config conf;
	mbedtls_x509_crt srvcert;
	mbedtls_pk_context pkey;
#if defined(MBEDTLS_SSL_CACHE_C)
	mbedtls_ssl_cache_context cache;
#endif

	mbedtls_net_init(&listen_fd);
	mbedtls_net_init(&client_fd);
	mbedtls_ssl_init(&ssl);
	mbedtls_ssl_config_init(&conf);
#if defined(MBEDTLS_SSL_CACHE_C)
	mbedtls_ssl_cache_init(&cache);
#endif
	mbedtls_x509_crt_init(&srvcert);
	mbedtls_pk_init(&pkey);
	mbedtls_entropy_init(&entropy);
	mbedtls_ctr_drbg_init(&ctr_drbg);

#if defined(MBEDTLS_DEBUG_C)
	mbedtls_debug_set_threshold(DEBUG_LEVEL);
#endif

	/*
	 * 1. Load the certificates and private RSA key
	 */
	mbedtls_printf("\n  . Loading the server cert. and key...");
	fflush(stdout);

	/*
	 * This demonstration program uses embedded test certificates.
	 * Instead, you may want to use mbedtls_x509_crt_parse_file() to read the
	 * server and CA certificates, as well as mbedtls_pk_parse_keyfile().
	 */
	ret = mbedtls_x509_crt_parse(&srvcert, (const unsigned char *)mbedtls_test_srv_crt, mbedtls_test_srv_crt_len);
	if (ret != 0) {
		mbedtls_printf(" failed\n  !  mbedtls_x509_crt_parse returned %d\n\n", ret);
		goto exit;
	}

	ret = mbedtls_x509_crt_parse(&srvcert, (const unsigned char *)mbedtls_test_cas_pem, mbedtls_test_cas_pem_len);
	if (ret != 0) {
		mbedtls_printf(" failed\n  !  mbedtls_x509_crt_parse returned %d\n\n", ret);
		goto exit;
	}

	ret = mbedtls_pk_parse_key(&pkey, (const unsigned char *)mbedtls_test_srv_key, mbedtls_test_srv_key_len, NULL, 0);
	if (ret != 0) {
		mbedtls_printf(" failed\n  !  mbedtls_pk_parse_key returned %d\n\n", ret);
		goto exit;
	}

	mbedtls_printf(" ok\n");

	/*
	 * 2. Setup the listening TCP socket
	 */
	mbedtls_printf("  . Bind on https://localhost:4433/ ...");
	fflush(stdout);

	if ((ret = mbedtls_net_bind(&listen_fd, NULL, "4433", MBEDTLS_NET_PROTO_TCP)) != 0) {
		mbedtls_printf(" failed\n  ! mbedtls_net_bind returned %d\n\n", ret);
		goto exit;
	}

	mbedtls_printf(" ok\n");

	/*
	 * 3. Seed the RNG
	 */
	mbedtls_printf("  . Seeding the random number generator...");
	fflush(stdout);

	if ((ret = mbedtls_ctr_drbg_seed(&ctr_drbg, mbedtls_entropy_func, &entropy, (const unsigned char *)pers, strlen(pers))) != 0) {
		mbedtls_printf(" failed\n  ! mbedtls_ctr_drbg_seed returned %d\n", ret);
		goto exit;
	}

	mbedtls_printf(" ok\n");

	/*
	 * 4. Setup stuff
	 */
	mbedtls_printf("  . Setting up the SSL data....");
	fflush(stdout);

	if ((ret = mbedtls_ssl_config_defaults(&conf, MBEDTLS_SSL_IS_SERVER, MBEDTLS_SSL_TRANSPORT_STREAM, MBEDTLS_SSL_PRESET_DEFAULT)) != 0) {
		mbedtls_printf(" failed\n  ! mbedtls_ssl_config_defaults returned %d\n\n", ret);
		goto exit;
	}

	mbedtls_ssl_conf_rng(&conf, mbedtls_ctr_drbg_random, &ctr_drbg);
	mbedtls_ssl_conf_dbg(&conf, my_debug, stdout);

#if defined(MBEDTLS_SSL_CACHE_C)
	mbedtls_ssl_conf_session_cache(&conf, &cache, mbedtls_ssl_cache_get, mbedtls_ssl_cache_set);
#endif

	mbedtls_ssl_conf_ca_chain(&conf, srvcert.next, NULL);
	if ((ret = mbedtls_ssl_conf_own_cert(&conf, &srvcert, &pkey)) != 0) {
		mbedtls_printf(" failed\n  ! mbedtls_ssl_conf_own_cert returned %d\n\n", ret);
		goto exit;
	}

	if ((ret = mbedtls_ssl_setup(&ssl, &conf)) != 0) {
		mbedtls_printf(" failed\n  ! mbedtls_ssl_setup returned %d\n\n", ret);
		goto exit;
	}

	mbedtls_printf(" ok\n");

reset:
#ifdef MBEDTLS_ERROR_C
	if (ret != 0) {
		char error_buf[100];
		mbedtls_strerror(ret, error_buf, 100);
		mbedtls_printf("Last error was: %d - %s\n\n", ret, error_buf);
	}
#endif

	mbedtls_net_free(&client_fd);

	mbedtls_ssl_session_reset(&ssl);

	/*
	 * 3. Wait until a client connects
	 */
	mbedtls_printf("  . Waiting for a remote connection ...");
	fflush(stdout);
	const int *ciphersuites = mbedtls_ssl_list_ciphersuites();
	for (iii = 0; iii < (sizeof(ciphersuites) / sizeof(ciphersuites[0])); iii++) {
		printf("csuite %s\n", mbedtls_ssl_get_ciphersuite_name(ciphersuites[iii]));
	}

	if ((ret = mbedtls_net_accept(&listen_fd, &client_fd, NULL, 0, NULL)) != 0) {
		mbedtls_printf(" failed\n  ! mbedtls_net_accept returned %d\n\n", ret);
		goto exit;
	}

	mbedtls_ssl_set_bio(&ssl, &client_fd, mbedtls_net_send, mbedtls_net_recv, NULL);

	mbedtls_printf(" ok\n");

	/*
	 * 5. Handshake
	 */
	mbedtls_printf("  . Performing the SSL/TLS handshake...");
	fflush(stdout);

	while ((ret = mbedtls_ssl_handshake(&ssl)) != 0) {
		if (ret != MBEDTLS_ERR_SSL_WANT_READ && ret != MBEDTLS_ERR_SSL_WANT_WRITE) {
			mbedtls_printf(" failed\n  ! mbedtls_ssl_handshake returned %d\n\n", ret);
			goto reset;
		}
	}

	mbedtls_printf(" ok\n");

	/*
	 * 6. Read the HTTP Request
	 */
	mbedtls_printf("  < Read from client:");
	fflush(stdout);

	do {
		len = sizeof(buf) - 1;
		memset(buf, 0, sizeof(buf));
		ret = mbedtls_ssl_read(&ssl, buf, len);

		if (ret == MBEDTLS_ERR_SSL_WANT_READ || ret == MBEDTLS_ERR_SSL_WANT_WRITE) {
			continue;
		}

		if (ret <= 0) {
			switch (ret) {
			case MBEDTLS_ERR_SSL_PEER_CLOSE_NOTIFY:
				mbedtls_printf(" connection was closed gracefully\n");
				break;

			case MBEDTLS_ERR_NET_CONN_RESET:
				mbedtls_printf(" connection was reset by peer\n");
				break;

			default:
				mbedtls_printf(" mbedtls_ssl_read returned -0x%x\n", -ret);
				break;
			}

			break;
		}

		len = ret;
		mbedtls_printf(" %d bytes read\n\n%s", len, (char *)buf);

		if (ret > 0) {
			break;
		}
	} while (1);

	/*
	 * 7. Write the 200 Response
	 */
	mbedtls_printf("  > Write to client:");
	fflush(stdout);

	len = sprintf((char *)buf, HTTP_RESPONSE, mbedtls_ssl_get_ciphersuite(&ssl));

	while ((ret = mbedtls_ssl_write(&ssl, buf, len)) <= 0) {
		if (ret == MBEDTLS_ERR_NET_CONN_RESET) {
			mbedtls_printf(" failed\n  ! peer closed the connection\n\n");
			goto reset;
		}

		if (ret != MBEDTLS_ERR_SSL_WANT_READ && ret != MBEDTLS_ERR_SSL_WANT_WRITE) {
			mbedtls_printf(" failed\n  ! mbedtls_ssl_write returned %d\n\n", ret);
			goto exit;
		}
	}

	len = ret;
	mbedtls_printf(" %d bytes written\n\n%s\n", len, (char *)buf);

	mbedtls_printf("  . Closing the connection...");

	while ((ret = mbedtls_ssl_close_notify(&ssl)) < 0) {
		if (ret != MBEDTLS_ERR_SSL_WANT_READ && ret != MBEDTLS_ERR_SSL_WANT_WRITE) {
			mbedtls_printf(" failed\n  ! mbedtls_ssl_close_notify returned %d\n\n", ret);
			goto reset;
		}
	}

	mbedtls_printf(" ok\n");

	ret = 0;
	goto reset;

exit:

#ifdef MBEDTLS_ERROR_C
	if (ret != 0) {
		char error_buf[100];
		mbedtls_strerror(ret, error_buf, 100);
		mbedtls_printf("Last error was: %d - %s\n\n", ret, error_buf);
	}
#endif

	mbedtls_net_free(&client_fd);
	mbedtls_net_free(&listen_fd);

	mbedtls_x509_crt_free(&srvcert);
	mbedtls_pk_free(&pkey);
	mbedtls_ssl_free(&ssl);
	mbedtls_ssl_config_free(&conf);
#if defined(MBEDTLS_SSL_CACHE_C)
	mbedtls_ssl_cache_free(&cache);
#endif
	mbedtls_ctr_drbg_free(&ctr_drbg);
	mbedtls_entropy_free(&entropy);

#if defined(_WIN32)
	mbedtls_printf("  Press Enter to exit this program.\n");
	fflush(stdout);
	getchar();
#endif

	return (ret);
}
#endif							/* MBEDTLS_BIGNUM_C && MBEDTLS_CERTS_C && MBEDTLS_ENTROPY_C &&
								   MBEDTLS_SSL_TLS_C && MBEDTLS_SSL_SRV_C && MBEDTLS_NET_C &&
								   MBEDTLS_RSA_C && MBEDTLS_CTR_DRBG_C && MBEDTLS_X509_CRT_PARSE_C
								   && MBEDTLS_FS_IO && MBEDTLS_PEM_PARSE_C */
